Again, public health is about the community, not individuals. Each one of us is a possible vector for a deadly disease that, if uncontrolled, has the capacity to destroy hospital systems. With highly transmissible new variants & ~50% vaccinated, masks are still necessary 
This continues to be something people do not understand: one of the main goals is to prevent hospital collapse. That has always been the case. It's not like, "Oh, people choose to not get vaccinated, sucks for them." It will suck for the entire community
Another related goal is to stop transmission in order to mitigate mutations. So far, our vaccines are strong against the variants. That won't necessarily always be the case. And each new transmission creates a new opportunity for mutation.
So, yes, masks on airlines are still good as long as our vaccination rate stays where it is. Frankly, mask mandates probably shouldn't have been relaxed at all, given low rates of vaccination in several counties. Now we've got a new highly transmissible variant on our hands.
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